Questions tagged [weather]

Weather means the atmospheric conditions, including wind, temperature and precipitation, in a specific area at a specific time.

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Can airflow reverse over the flight surfaces of a uav in high wind conditions

Can airflow reverse over the wing of a uav in high tail winds and low forward airspeed i.e 25knt fwd airspeed in a 35 knt tailwind? What would be the overall effect on the elevator and rudder? I ...
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Approach when weather condition is below minimum

If airport weather condition is below minimum, but pilot report that flight weather condition is above minimum, Does controller can issue approach clearance to pilot? If weather condition get worse ...
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NEXRAD—why is it 2D?

If you paid attention to NEXRAD training, you know that the colors of pixels show the maximum activity at any altitude in that air column. (It’s a “composite” view.) NEXRAD itself samples in three ...
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How did pilots avoid thunderstorms and related weather before “reliable” airborne weather radar was introduced on airliners?

How did airline and or mail pilots avoid hazardous weather especially at night before airborne weather radar systems were in use?
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1answer
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Does an uncovered naval aircraft suffer any weathering affects?

This question is for WW2-era naval aircraft. I noticed that some cruisers and battleships carried a couple seaplanes, launched by catapult and recovered with cranes. Obviously these are unprotected ...
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262 views

What does NSC mean in a METAR?

Here's a METAR: SCEL 090000Z 15005KT 5000 HZ NSC 10/08 Q1020 NOSIG What does NSC mean?
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When do flights get cancelled due to fog?

When flights get cancelled due to fog, what triggers the cancellation? Fog is too thick, too wide-spread, blocks the view of tall buildings or other landmarks? Or is the problem the type of air ...
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1answer
94 views

What kind of input is used by NASA's TASAR?

I've found the Aviation SE to be a really interesting read so far, I'm excited to be here! I'm fairly new, but I'm also old! What are the inputs for TASAR to crunch flight path optimization? Is it ...
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1answer
66 views

What the weather condition can affect for flight? [closed]

What is the most disturbing weather conditions for flight? On another word: what more dangerous for takeoff/landing: wind, precipitation or something else?
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What does the future of the weather radars look like?

Planes had weather radars for a long time (Dassault Falcon and Learjet35A) which was useful since you either had to ask ATC, listen the ATIS frequency or ask the flight advisory before flight planning ...
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367 views

What is an “all-weather” aircraft?

I've read a few times that such-and-such a plane is an "all-weather" aircraft, for example: The McDonnell Douglas F/A-18 Hornet is a twin-engine, supersonic, all-weather, carrier-capable, multirole ...
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1answer
169 views

What are the duration of TAFs?

TAFs (terminal aerodrome forecast) have different durations. Some forecasts 30 hours into the future while others forecasts only 24 hours. But what is the shortest and longest TAFs? and how often are ...
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What is the relation between clouds and radar effectiveness?

Recently, India's prime minister Narendra Modi commented on how cloudy weather can help a fighter jet escape from radar. Is there any technical reasoning to back these comments? Here is the quote ...
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1answer
183 views

For an airport to be designated as an IFR alternate, does it have to have a TAF?

For an airport to be designated as an IFR alternate, does it have to have a terminal aerodrome forecast at the alternate airport to confirm that the forecast 600-2 and 800-2 will be in place at the ...
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1answer
235 views

Why is a small amount of smooth ice over the top of the wing more dangerous than an accumulation on the leading edge?

According to a Gleim study guide, "Generally speaking, smooth ice on top of the wing is more dangerous than heavy accumulated icing on the leading edge." Is this true? If this is true, why?
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Are there more accidents in winter months, and if so, why?

I was watching The Flight Channel videos and have noticed that the accidents seem to happen more often in winter months (for the Northern Hemisphere). Are there some statistics to back this claim? It ...
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1answer
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What is the meaning of R88/70D in this METAR from Ashgabat International airport?

The following METAR is from Ashgabat airport (UTAA) UTAA 071300Z 13006KT 9999 FEW050CB BKN050 BKN100 15/06 Q1013 R88/70D NOSIG What does R88/70D mean, I couldn't find any references?
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1answer
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Is navigation around thunderheads done at the pilot's discretion?

It's my understanding that if a pilot is flying over an ocean or otherwise uncontrolled airspace and they encounter a cumulonimbus, they navigate around it at their discretion. How does this happen ...
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What is the purpose of including sea level pressure and temperature in a METAR?

In a METAR such as this one: KGOK 161553Z AUTO 18011KT 4SM BR OVC007 07/05 A3011 RMK AO2 SLP201 T00670050 Translated to: Jan 16, 1553Z, Automated. Mist, Wind from 180° at 11 knots, 4 statute ...
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112 views

How is the effect of wind on arrival time handled?

If a commercial plane encounters strong tailwinds, would the pilots set the autopilot for a fixed arrival time (if that is possible), or would it be ok to arrive way ahead of schedule? I imagine ...
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1answer
126 views

When is a high pressure system associated with IFR/MVFR conditions?

So I've read that typically high pressure systems bring good weather and clear skies. However, for the current high pressure system we're experiencing in central USA, we're having quite a bit of IFR/...
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1answer
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Can a SIGMET last less than initially forecasted?

Lets say I have a SIGMET that says VALID 310800/311200. Is it possible that by 1100 the SIGMET would not be active anymore or it will always be valid until the published end time?
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Did AF447 cross dangerous weather?

question Did the Air France 447 pilots endanger the passengers by not diverting around but flying straight through the weather system encountered and pictured below ? Or was this a defendable, ...
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318 views

When do pilots facing bad weather turn back (U-turn)?

Passenger aircraft are not supposed to cross red areas on the weather radar. But what if the weather system is too large to circumnavigate and red areas inside the system are too large/prevalent to ...
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Are winds that are not from the prevailing wind direction more often gusty, and why?

It seems to me that, looking at the ground weather forecasts (as opposed to, say, low level forecasts), it's far more common for the wind to be predicted to be significantly gusty when it is blowing ...
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How do pilots decide whether to circumnavigate bad weather?

How does an airline pilot decide in the air whether to circumnavigate or fly through bad weather visibly looming ahead and/or displayed on the weather radar ?
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What is the specific FAA regulation with regards to a pilot dropping jumpers into a solid cloud base? [duplicate]

What is the FAA regulation with regards to a pilot dropping jumpers into a solid cloud base? I saw some parachute jumpers come through a solid cloud layer with a base at around 1300 AGL. They landed ...
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1answer
229 views

Do any civilian aircraft use AESA or PESA for weather radar?

Are there any weather radars in civilian aircraft that uses active or passive array techniques? I know that the most of the radar used in the civilian aircraft use doppler effect and latest military ...
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1answer
298 views

What if the tower Is obstructed by clouds?

I know towers use radar to watch aircraft, obviously. But what about ground controllers? What if their view is obstructed by a low cloud level/fog? Is there such a thing as ground-based traffic ...
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59 views

Remote access to Area Forecast Discussion

Is it possible to access Area Forecast Discussion via SMS? I fly to remote areas frequently (Wilderness), and after several days, it is almost impossible to get a good weather forecast, (one you're ...
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Diversions because of fog: What are the reasons?

It's fog season again around my local airport MUC (EDDM), and I have noticed a number of diversions recently. Some planes were holding a bit before attempting to land, performed a go around and then ...
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1answer
118 views

With wind, what will a perfectly circular flight path relative to the surrounding air look like from the ground? [duplicate]

Let's suppose that an airplane flying at a uniform airspeed follows a perfect, level, closed circular trajectory with respect to the mass of air. Now, seen from the ground, and in the presence of a ...
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How long does a wind shear last?

I've got a job interview next week and the interviewer asked my colleagues this question. I didn't find the answer online, I personally don't think that there is a certain duration for a wind shear ...
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What should I look for in weather reports in order to pick a day for glider flying?

I understand weather can change unexpectedly, and local sky condition (e.g. cloud types) can't be predicted, but if I want to fly glider at a specific location, say, some time next week, and use ...
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921 views

Do IFR / VFR weather minimums include ceilings?

I'm not really sure how to ask my question, but there are classifications for weather conditions for MVFR, IFR, and LIFR. The FAA also has weather minimums for flying VFR in the different airspaces ...
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How did this air force plane likely get into the eye of Hurricane Florence? [duplicate]

The annotation for this CNN video says Air Force plane flies into Hurricane Florence Watch as a US Air Force plane flies into the eye of Hurricane Florence to collect weather data for the ...
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Is the size of hail on the ground any indication of the winds and updrafts of a thunderstorm?

Is there any rule of thumb or way to estimate the wind speeds or up and down drafts inside a storm by the size of hail that reaches the ground?
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Can small planes see lights on the ground?

I live about 5 miles from a small airport. At night, during rain or snow storms when I imagine there would be poor visibility, I always turn our outside house lights on, in case they could possibly ...
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2answers
2k views

When the winds aloft are light and variable, what wind direction and speed should I use for flight planning?

What do you input in a navlog for wind direction and velocity, when the wind and temp forecast says 9900+18? I know 9900 means light and variable winds less than 5kts but how do I determine the ...
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1answer
252 views

Where can I find the German GAFOR online?

Where can I access the GAFOR for Germany for free online (or at least something close)?
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146 views

Weather Reporting of wind direction [duplicate]

General weather reporting for wind direction in Australian Standard the degrees in wind direction identifies where the wind is coming from. Is it the same around the world?
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1answer
427 views

In an ATIS broadcast, is the visibility in statute or nautical miles?

I think I remember seeing somewhere that since it's an observation at the surface, statute miles are used for the visibility. Would be nice if someone had a reference.
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Was ATC overstepping its boundaries when advising a pilot to ignore a cell warning?

I found a clip on YouTube (via an article on Jalopnik) of an Aer Lingus pilot departing from JFK. Due to a weather cell showing up on his instruments, he can not make the left ATC asks him to make. ...
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1answer
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Why is the flight duration of the same flight different in different months? [duplicate]

For example: CX880 (HKG TO LAX) takes 13h40m on the 2nd of August, but only takes 12h50m in September. CI008 (TPE TO LAX) is the same; it takes half an hour less in September than in August. What ...
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How do hot air balloons navigate?

Hot air balloons are quite obviously carried along with the wind, so how can they be navigated? Choosing the correct launch point relative to the desired landing point would seem to play a major part ...
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Can a weather forecast tell me if airplanes will leave long contrails? [duplicate]

Training 7 ball and 5 club juggling requires me to look up into the sky for durations of up to one minute. Frequently, this is very taxing on my eyes and, frustratingly, requires me to wear sunglasses....
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1answer
181 views

What does this wind symbol mean? [duplicate]

At https://www.aviationweather.gov on the Forecasts puldown, then the Aviation Forecasts selection, the chart opens and often shows what looks like a letter R with a tail in the lower right, in ...
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Icing conditions temperature range: SAT or TAT?

Considering the general rule of thumb defining potential icing conditions: temperature between +10 and -40 degrees C and presence of visible moisture, is the temperature range regarding TAT (total ...
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1answer
351 views

Why were these Hawkeyes flying in a circular pattern?

A couple of months ago I was near the Wallops Flight Facility in Virginia, when I saw 3 or 4 planes flying in a tight circular pattern. The planes were on the larger side, prop driven and had large ...
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1answer
646 views

Why does GR mean hail in a METAR?

Wouldn't you think they'd choose HL instead? That might confuse pilots who frequently see SS (Sandstorms), DS (Dust Storms) and VA (Volcanic Ash).